← Area code 534
534-331 phone numbers
Numbers 534-331-0000 to 534-331-9999 are assigned to Level 3 Communications, LLC in Iron River, WI. 2 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 534-331-0xxx, 534-331-2xxx, 534-331-3xxx, 534-331-4xxx, 534-331-5xxx, 534-331-6xxx, 534-331-8xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.